Bigger sensor, more compact body, much faster AF in both still and video, double the resolution, longer battery life and much more features like panorama mode, 60fps video, etc. To top it off the price is better.

So why anyone would prefer the G1X2 ?

the concept of purchasing a higher quality P&S is that the P&S is the entire kit you are walking around with.

with the A6000 or whatever MILC you want to have a fancy for, you have to carry around a bag with various lenses, switch them out to cover the focal range, etc,etc. It's certainly not as "grab and go" as a P&S - thus the attraction of the higher end non-interchangeable cameras.